Thiadiazolyl monoazo dyestuffs



United States Patent ABSTRACT OF THE DISCLOSURE Thiadiazolyl-azo-aniline compounds having a di(acyl)- amidoalkyl group attached to the aniline nitrogen atom are useful as dyes for hydrophobic fibers.

This invention relates to azo compounds particularly useful as dyes for textile fibers, yarns and fabrics. More particularly this invention relates to azo compounds of the general formula R represents a monocyclic aromatic radical of the henzene series including unsubstituted phenylene, e.g., pphenylene and substituted phenylene, e.g., such as lower alkylphenylene, e.g., o,m-methyl-p-phenylene; lower alkoxyphenylene, e.g., o,m-mcthoxy-p-phenylene, 2,5- dimethoxy p phenylene; lower alkauoylamidophenylene, e.g., o,m-acetamido-p-phenylene; halophenylene, e.g., o,m-chloro-p-phenylene; lower alkylsulfonamidophenylene, e.g., o,m methylsulfonamido-p-phenylene; benzamidophenylene; and lower alkylthiophenylene, e.g., o,m-methylthio-p-phenylene.

R represents hydrogen or an alkyl radical preferably lower alkyl, i.e., from 1 to 4 carbon atoms, being unsubstituted or substituted such as hydroxyalkyl, e.g., hydroxyethyl; lower alkoxyalkyl, e.g., methoxyethyl; cyanoalkyl, e.g., cyanoethyl; lower alkanoyloxyalkyl, e.g., acetoxyethyl; lower alkoxycarbonylalkyl, e.g., ethoxycarbonylethyl; halogenoalkyl, e.g., chloroethyl; lower alkylsulfonylalkyl, e.g., methylsulfonylethyl; carbamoylalkyl, e.g., carbamoylethyl, etc., or R represents a monocyclic aromatic radical of the benzene series such as lower alkylphenyl, lower alkoxyphenyl, halophenyl and other substituted phenyl groups given above, or may be the same as R NXY,

R represents a lower alkylene group, Le, a straight or branched chain of from 1 to 4 carbon atoms, and

X and Y represent the same or difierent acyl groups, in-

cluding carboxylic acid acyl such as, lower alkanoyl, e.g., propionyl; aroyl, e.g., benzloyl; lower alkoxycarbonyl, e.g., ethoxycarbonyl; carbamoyl, e.g. phenyl carbamoyl, etc., or sulfonyl groups such as lower alkylsulfonyl, e.g., methylsulfonyl; arylsulfonyl, e.g., phenylsulfonyl, and

Q represents a Z-thiadiazolyl radical having the formula:

wherein R represents H; or an organic radical such as lower alkyl, e.g., methyl, ethyl, propyl, isopropyl; aryl, e.g., phenyl, unsubstituted or substituted such as p-nitrophenyl, paminophenyl, lower alkylphenyl, e.g., o-tolyl, p-tolyl; lower alkylthio, e.g., methylthio, ethylthio, isopropylthio, etc.; arylthio, e.g., phenylthio, substituted phenylthio, etc.; lower alkylsulfonyl, methylsulfonyl, ethylsulfonyl, propylsulfonyl, isopropylsulfonyl, cyclohexylsulfonyl, etc.; arylsulfonyl, e.g., p-nitrophenylsulfonyl, benzenesulfonyl, m-nitrophenylsulfonyl a-naphthylsulfonyl, sulfonylamido, e.g., benzenesulfonamido, p-nitrobenzenesulfonamido, lower alkylphenylsulfonamido, oethylphenylsulfonamido, lower alkanoylamido, e.g., acetamido; benzamido, substituted benzamido, etc.

The azo compounds of this invention are prepared by diazotization of Z-aminothiadiazoles and coupling the diazotized products with the coupler of the general formula (III) 1'1, X

HR1NRa-N\ Y wherein R R R X and Y have the meanings given above.

Particularly useful compounds of this invention are of the three general formulas:

wherein R, R R and R are defined above R and R lower alkyl, lower alkoxy, phenyl, or phenyl substituted with lower alkyl, lower alkoxy, or halogen,

R and R =lower alkyl, phenyl, or phenyl substituted with lower alkyl, lower alkoxy, or halogen, and

R and R =lower alkoxy, phenyl, or phenyl substituted with lower alkyl, lower alkoxy, or halogen.

The groups X and Y differentiate these compounds from prior art compounds and favorably affect the dye characteristics such as light fastness and resistance to sublimation, especially when the compounds are used for dying textile materials. The substituents attached to thiadiazolyl radical, R, or to R R and R are not critical and serve primaril as auxochromes to control the color of the azo compound.

The specific alkyl radicals and monocyclic aromatic radicals given above are also exemplary of the R R group.

The coupling components having the above Formula II are prepared in the following manner:

wherein R R R X and Y are as defined above. These reactions result in compounds in which the newly substituted amines are diacyl substituted, disulphonyl substituted or acylsulphonyl substituted depending on the reactants chosen. A more detailed description of the coupler synthesis appears in preparative examples of co-pending application Ser. No. 458,417 and now Patent No. 3,379,7 l 3.

The resultant azo compounds can be used for dyeing textile materials including synthetic polymer fibers, yarns and fabrics giving a variety of fast shades including blue,

yellow, red and brown when applied thereto by conventional dyeing methods. The compounds have moderate affinity for cellulose ester and polyamide fibers and possess the valuable property of staining wool less than do previous thiadiazole dyes. When the azo compounds are used for dyeing such hydrophobic materials, they should be free of water-solubilizing groups such as sulfo and carboxyl. In general the dyes have good fastness, for example, to light, washing, gas (atmospheric fumes) and sublimation.

The following examples will serve to illustrate the preparation of representative azo compounds of our invention. All of the couplers used were prepared in the manner described in copending application Ser. No. 458,417 and now Patent No. 3,379,313.

EXAMPLE 1 (A) Diazotization.2.94 g. (0.02 m.) 2-amino-5- methylthio-l,3,4-thiadiazole was dissolved in 48 ml. of water containing 28 ml. conc. sulfuric acid at about 40 C. This solution was cooled to 5 C. and a solution of 1.44 g. NaNO, in 10 ml. conc. sulfuric acid was added at about 5 C. The reaction mixture was stirred at ice bath temperature for 2 hrs.

(B) Coupling.--5.96 g. (0.02 m.) of N-acetyl-N-[2- (N-etbyl-m-toluidino)ethyl]methanesulfonamide was dissolved in 100 ml. of 1:5 acid (1 part propionic acid to 5 parts acetic acid). This solution was cooled in an ice bath and the diazotization reaction mixture from Example 1(A) was added with stirring. The coupling mixture was neutralized with solid ammonium acetate to brown on Congo red paper. After coupling in the cold for 2 hrs., the mixture was drowned in 1 liter of water, filtered, washed with water and dried. The product dyed polyester fibers a red shade of excellent fastness properties. The dye has the following structure:

I F 03H. C Has-C CN=N N C O Ha S C2H4N S O 20 H EXAMPLE 2 (A) Diazotization.-The diazotization reaction mixture was prepared as in Example 1(A).

(B) Coupling-5.32 g. (0.02 m.) N-[2-(N'-ethyl-mtoluidino)ethyl]diacetamide was dissolved in 100 ml. of 1:5 acid (1 part propionic acid to parts acetic acid). This solution was cooled in an ice bath and the diazotization reaction mixture from Example 2(A) was added with stirring. The coupling mixture was neutralized with solid ammonium acetate to brown on Congo red paper. After coupling in the cold for 2 hrs., the mixture was drowned in 1 liter of water, filtered, washed with water and dried. The product dyed polyester fibers red shades of excellent fastness. The dye has the following structure:

Substituents Ring of Bi No. On

19:: do 20.. CH:--

4 EXAMPLE 3 (A) Diazotization.The diazotization reaction mixture was prepared as in Example 1(A).

(B) Coupling.The procedure of Example 1(B) was utilized except that the coupler used was 6.68 g. (0.02 mole) N [2 (N'-ethyl-m-toluidino)ethyl]dimethanesulfonamide. This dye gives red shades of good fastness on polyester fibers. The dye has the following structure:

(A) Diazotization.-3.72 g. (0.02 m.) 2-amino-5-2'- cyanoethylthio-1,3,4-thiadiazole was dissolved in 48 ml. of water containing 28 ml. conc. sulfuric acid at about 40 C. This solution was cooled to 5 C. and a solution of 1.44 g. NaNO in 10 ml. conc. sulfuric acid was added at about 5 C. The reaction mixture was stirred at ice bath temperature for 2 hrs.

(B) Coupling.The procedure of Example 1(B) was used using the diazo reaction mixture from Example 4(A). The dye gives red shades of good fastness on polyester fibers. The dye has the following structure:

C 0 CH3 SOzCH:

EXAMPLE 5 (A) Diazotization.3.6'6 g. (0.02 m.) Z-amino-S- phenyl-1,3,4-thiadiaz.ole was dissolved in 48 ml. of water containing 28 m1. cone. sulfuric acid at about 40 C. This solution was cooled to 5' C. and a solution of 1.44 g. NaNO in 10 ml. conc. sulfuric acid was added at about 5 C. The reaction mixture was stirred at ice bath temperature for 2 hrs.

(B) Coupling.The procedure of Example 2(B) was used using the diazotization reaction mixture from Example 5(A). The dye gives red shades of good fastness on polyester fibers. The dye has the following structure:

The azo compounds of the following table are prepared utilizing the preparative methods described above. The color indicated is that obtainable upon dyeing polyester fibers.

R: X Y Color Orange. *COCHa..- --SO1CH3. DO.

Example R Substituents B, R; X Y Color No. 01: Ring 01 R1 -CH|CH2- -S0:CH;.-- COCH; Violet.

S02CHL-.SOZOHL..... Do. SO:CH:.... SOzCHa Red. -s0-.oHl 410cm... -SOzOH:

. S03CHa S02CH3 SO lCH:

-SO2CH3..- 32. -SO1CH3. as Cl s0.0m COCH= Red. 34 -CH O02C2Hs -SUzCH -COCH: Red.

The azo compounds of the invention may be used for and modifications can be effected within the spirit and dyeing hydrophobic fibers such as linear polyester, celluscope of the invention as described hereinabove, and as lose ester, acrylic, polyamide, etc., fibers in the manner defined in the appended claims. described in U.S. Patents 2,880,050, 2,757,064, 2,782,187 We claim: and 2,043,827. The following examples illustrate methods 1. An azo compound having the formula by which the azo compounds of the invention can be used RI x to dye polyester textile materials.

l 0.1 gram of the dye is dissolved in the dye pot by warming in 5 cc. of ethylene glycol monomethyl ether. A 2% s Y sodium-N-methyl-N-oleyl taurate and 0.5% sodium lignin wherein sulfonate aqueous solution is added, with stirring, until R i hydrogen, lower alkyl, lower alkylthio, cyano th p a fine emulsion IS obtained. Water is then slowly added ihio, phenyithio, cycioiiexyithioi iowei- ]k l lf l to a total volume of 200 cc. 3 cc. of Dacronyx (a chlorrh l lf l l h l lf l phenyi, iowainated benzene emulsion) are added and 10 grams of a alkylphenyl, phenylsulfonamido, lower alkylsulf textile fabric made of Kodei polyester fibers are entered. amide, iaweiaikanoyiamido, or benzamido; The fabric is worked 10 mlnutcs without heat and then R1 is p phenyiene p piieny1ene substituted with lower for 10 minutes at 80 C. The dyebath 15 then brought to lkyl, lo er alkoxy, halogen, lower alkylthio, lower the boil and held at the boil for one hour. Following this, aikimoyiamido, lower aikyisuifonamido or the fabric is rinsed in warm Water, then scoured in an amide; aqueous 0.2% soap, 0.2% soda ash solution. After scour- R2 iS hydrogen; iowei aikyi; iower aikyi substituted ing, the fabric is rinsed with water and dried. Accordingly, with hydi-oxy, lower aikoxy cyano lower aikanoyisince the azo compounds of the invention are water-insoloxy lower aikoxycarbonyi haiogci,i ioweiaikYisuiuble, they can be applied from aqueous dispersions in the fonyi carbamuyi. or phenyi substituted manner of the so-called dispersed dyes." However, colorwith lower aikyi 5 aikoxy or halogen. ation can also be effected, for example, by incorporating R i l er alkylene' and the azo compounds inm the spinning dope and Spinning X and Y are the same or different and each is lower the fiber as usual. The azo compounds of our invention aikanoyi, benzoyi, lower aikyibenzoyl lower aikoxy have varying ut1l1ty as dyes. The degree of utility varies, benzoyi, haiobenzoyi lower alkoxyclirbonyi Iowa. 3 i f upon the mammal bemg dyed and alkylsulfonyl, phenylsulfonyl, lower alkylphenylsule a 0 t c azo compound Thus example an fonyl, lower alkoxyphenylsulfonyl, or halophenylthe dyes will not have the same degree of utility for the lf l same material A By cellulose aliphatic carboxylrc acid esters having 2 R2 s gizf accordmg to chum 1 wherem to carbon atoms in the acid groups thereof, we mean R3 is ethylene. i to include, for example, both partially hydrolyzed and un- X and Y lower aikanoyi lower aikoxycaibonyi hydrolyzed cellulose acetate, cellulose propionate and benzoyi lower aikyibenzoyi lower aikoxybenzoyi cellulose acetatebutyrate. haiogenzoyi Polymeric iinear polyester materials of the terephthal- 3. An azo compoimd according to claim 1 wherein ate type are Illustrative of the linear aromatic polyester R is iower aikyi. textile materials that can be dyed with the new azo comis ethylene.

pounds of our invention. The terephthalate fibers sold Xisiow i er alkanoyl, lower alkoxy benzo 1, lower alk lthe :fi Kodel Dacron and Teryiener henzoyl, lower alkoxybenzoyl, or halo hcnzoyl; and or examp e, in the form of filaments, yarn and fabric, for 0 Y is lower lk l lf i h i lf l lower k example, are illustrative of the polyester textlle materials h yl ulfonyl l er alkoxyphenylsulfonyl or haloihalt can be dyed. Kodel polyester fibers are more particuh l lf l ar y described in U.S. Patent 2,901,446. Dacron and I Terylene polyester fibers are described, for example, in 2 33i: :Rgii accordmg to clalm I wherem U.S. latent 2,465,3 1 9. The polymeric linear polyester 5 R3 iS eihyimei aiid materials disclosed In U.S. Patents 2,945,010, 2,957,745 X and Y are ioweiaikyisuifonyi, phenyisiiifonyi, lower and 2,989,363, for example, can be dyed. The linear aromatic polyester materials specifically named have a meltggggggifi ggj lower alkoxyphenylsulfonyl or ing point of at least 200 C. Nylon, in fiber, yarn and fabric form is representative An azo compound ofthe formula" of polyamides which can be dyed with the azo com- Gil-I,

N N pounds c H S-(3 tiN=N N/ c o o H.

The invention has been described in considerable detail 3 \G9II4N/ H:

with particular reference to certain preferred embodiments thereof, but it will be understood that variations 5020B 7 6. An azo compound of the general formula:

7. An azo compound of the general formula:

Z|\lN 02H;

8. An azo compound of the general formula: N-lfi1 (32H; Nccnns-o COCH;

COGllz SOzCH;

8 9. An azo compound of the general formula:

References Cited UNITED STATES PATENTS N-N ll H C C COCH:

CzHqN COCHJ 15 CHARLES B. PARKER, Primary Examiner.

D. M. PAPUGA, Assistant Examiner.

US. Cl. X.R. 

